For the longest necklace, take your 18" chain and thread on your opalite chakra pendant. 

For the next necklace, take your 16" chain and thread on a jumpring. 
Attach your flower coin connector charm to this jumpring and attach two jumprings onto each of the bottom loops.
Attach two stars to the lowest jumprings.

For the shortest silver necklace, cut your chain to approx 11" or whatever length comfortable fits around your neck, including the clasp. 
Attach a jumpring to both loops on your hand charm.
Thread these onto the chain so the chain threads behind the charm. 
Add a calotte or use a crimp bead to create a loop at the end of the chain that your clasp can attach to. 

For the seed bead choker, cut a length of elastic a bit longer than needed to fit comfortably around your neck, thread on your seed beads and attach jumprings from your sterling silver clasp with crimp beads.